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It varies: The planets closer to the Sun move faster (Kepler's Third Law). Mercury is fastest; according to Wikipedia, its average orbital speed is 47.87 km/s. Multiply that by 0.6 to get the approximate speed in miles per second.
175 kilometers = 108.74 miles (rounded) But they're both distances, not speeds.
The escalators move at the speeds of 31.07 miles per hour.
"Faster" refers to speeds. Miles and kilometers are units of distance, not of speed.
To convert from miles per hour to miles per second, use this formula:mph x 0.0002778 = miles per second